I want to build templates that would render {{PMC|PMC number}} as a PMC number. That is, hyperlinked to the respective PubMed Central entry for said number. For example, {{PMC|2824929}} would be rendered as PMC 2824929.

For DOI names, it's pretty much the same deal (i.e., I write {{doi|doi number}}) but it comes out as the DOI number hyperlinked to the respective dx.doi.org entry. For example, {{doi|10.4103/0972-2327.56312}} would be rendered as: doi:10.4103/0972-2327.56312.